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Finding the Fourth Proportional to 328,221.32, 491,480.06 and 281,138.45

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Solution

The fourth proportional to 328,221.32, 491,480.06 and 281,138.45 is: 420,977.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    328,221.32 : 491,480.06 = 281,138.45 : x
  2. Step 2: Convert to fraction form
    328,221.32/491,480.06 = 281,138.45/x
  3. Step 3: Cross multiply
    328,221.32x = 491,480.06 × 281,138.45
  4. Step 4: Simplify right side
    328,221.32x = 138,173,938,411.21
  5. Step 5: Solve for x
    x = 138,173,938,411.21/328,221.32
  6. Step 6: Final answer
    x = 420,977.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.